X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fmount.c;h=6f50a4e5931d5d2b59a8dace45422edb7fb92b23;hp=844bb34d36c5bec0e1b9b43e9e837fb87aac9e63;hb=512d3f87a1e7b59ca19ae6d6965dbcf7f4a17c15;hpb=094dfab07d82eba2287a852a622deb3389cce94d diff --git a/src/mount.c b/src/mount.c index 844bb34d..6f50a4e5 100644 --- a/src/mount.c +++ b/src/mount.c @@ -5,30 +5,35 @@ * Filesystem in Userspace. FUSE allows a filesystem to be implemented in a * userspace process by implementing the filesystem primitives--- read(), * write(), readdir(), etc. - * + */ + +/* * Copyright (C) 2012 Eric Biggers * - * wimlib - Library for working with WIM files + * This file is part of wimlib, a library for working with WIM files. * - * This library is free software; you can redistribute it and/or modify it under - * the terms of the GNU Lesser General Public License as published by the Free - * Software Foundation; either version 2.1 of the License, or (at your option) any - * later version. + * wimlib is free software; you can redistribute it and/or modify it under the + * terms of the GNU General Public License as published by the Free + * Software Foundation; either version 3 of the License, or (at your option) + * any later version. * - * This library is distributed in the hope that it will be useful, but WITHOUT ANY - * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A - * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. + * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY + * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR + * A PARTICULAR PURPOSE. See the GNU General Public License for more + * details. * - * You should have received a copy of the GNU Lesser General Public License along - * with this library; if not, write to the Free Software Foundation, Inc., 59 - * Temple Place, Suite 330, Boston, MA 02111-1307 USA + * You should have received a copy of the GNU General Public License + * along with wimlib; if not, see http://www.gnu.org/licenses/. */ #include "wimlib_internal.h" #ifdef WITH_FUSE +#include "sha1.h" #include "lookup_table.h" #include "xml.h" +#include "io.h" +#include "timestamp.h" #include #include #include @@ -40,6 +45,18 @@ #include #include +#ifdef ENABLE_XATTR +#include +#endif + +struct wimlib_fd { + u16 idx; + int staging_fd; + u64 hard_link_group; + struct lookup_table_entry *lte; + struct dentry *dentry; +}; + /* The WIMStruct for the mounted WIM. */ static WIMStruct *w; @@ -60,6 +77,451 @@ static int mount_flags; /* Name of the directory on which the WIM file is mounted. */ static const char *mount_dir; +/* Next hard link group ID to be assigned. These are also used as the inode + * numbers. */ +static u64 next_link_group_id; + +/* List of lookup table entries in the staging directory */ +static LIST_HEAD(staging_list); + +static inline int get_lookup_flags() +{ + if (mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS) + return LOOKUP_FLAG_ADS_OK; + else + return 0; +} + +/* Returns nonzero if write permission is requested on the file open flags */ +static inline int flags_writable(int open_flags) +{ + return open_flags & (O_RDWR | O_WRONLY); +} + +/* + * Allocate a file descriptor for a lookup table entry + */ +static int alloc_wimlib_fd(struct lookup_table_entry *lte, + struct wimlib_fd **fd_ret) +{ + static const u16 fds_per_alloc = 8; + static const u16 max_fds = 0xffff; + + if (lte->num_opened_fds == lte->num_allocated_fds) { + struct wimlib_fd **fds; + u16 num_new_fds; + + if (lte->num_allocated_fds == max_fds) + return -EMFILE; + num_new_fds = min(fds_per_alloc, max_fds - lte->num_allocated_fds); + + fds = REALLOC(lte->fds, (lte->num_allocated_fds + num_new_fds) * + sizeof(lte->fds[0])); + if (!fds) + return -ENOMEM; + memset(&fds[lte->num_allocated_fds], 0, + num_new_fds * sizeof(fds[0])); + lte->fds = fds; + lte->num_allocated_fds += num_new_fds; + } + for (u16 i = 0; ; i++) { + if (!lte->fds[i]) { + struct wimlib_fd *fd = CALLOC(1, sizeof(*fd)); + if (!fd) + return -ENOMEM; + fd->staging_fd = -1; + fd->idx = i; + fd->lte = lte; + lte->fds[i] = fd; + lte->num_opened_fds++; + *fd_ret = fd; + return 0; + } + } +} + +static int close_wimlib_fd(struct wimlib_fd *fd) +{ + struct lookup_table_entry *lte = fd->lte; + + wimlib_assert(lte); + wimlib_assert(lte->num_opened_fds); + + if (lte->resource_location == RESOURCE_IN_STAGING_FILE) { + wimlib_assert(lte->staging_file_name); + wimlib_assert(fd->staging_fd != -1); + if (close(fd->staging_fd) != 0) + return -errno; + } + if (--lte->num_opened_fds == 0 && lte->refcnt == 0) { + if (lte->resource_location == RESOURCE_IN_STAGING_FILE) { + wimlib_assert(lte->staging_file_name); + unlink(lte->staging_file_name); + } + free_lookup_table_entry(lte); + } + wimlib_assert(lte->fds[fd->idx] == fd); + lte->fds[fd->idx] = NULL; + FREE(fd); + return 0; +} + +/* Remove a dentry and all its alternate file streams */ +static void remove_dentry(struct dentry *dentry, + struct lookup_table *lookup_table) +{ + wimlib_assert(dentry); + wimlib_assert(dentry->resolved); + + struct lookup_table_entry *lte = dentry->lte; + u16 i = 0; + while (1) { + lte = lte_decrement_refcnt(lte, lookup_table); + if (lte && lte->num_opened_fds) + for (u16 i = 0; i < lte->num_allocated_fds; i++) + if (lte->fds[i] && lte->fds[i]->dentry == dentry) + lte->fds[i]->dentry = NULL; + if (i == dentry->num_ads) + break; + lte = dentry->ads_entries[i].lte; + i++; + } + + unlink_dentry(dentry); + put_dentry(dentry); +} + +static void remove_ads(struct dentry *dentry, + struct ads_entry *ads_entry, + struct lookup_table *lookup_table) +{ + struct lookup_table_entry *lte; + + wimlib_assert(dentry->resolved); + + lte = lte_decrement_refcnt(ads_entry->lte, lookup_table); + if (lte) + list_del(&ads_entry->lte_group_list.list); + dentry_remove_ads(dentry, ads_entry); +} + +/* Transfers file attributes from a struct dentry to a `stat' buffer. */ +int dentry_to_stbuf(const struct dentry *dentry, struct stat *stbuf) +{ + struct lookup_table_entry *lte; + + if (dentry_is_symlink(dentry)) + stbuf->st_mode = S_IFLNK | 0777; + else if (dentry_is_directory(dentry)) + stbuf->st_mode = S_IFDIR | 0755; + else + stbuf->st_mode = S_IFREG | 0644; + + stbuf->st_ino = (ino_t)dentry->link_group_id; + + stbuf->st_nlink = dentry_link_group_size(dentry); + stbuf->st_uid = getuid(); + stbuf->st_gid = getgid(); + + /* Use the size of the unnamed (default) file stream. */ + lte = dentry_unnamed_lte_resolved(dentry); + if (lte) { + if (lte->resource_location == RESOURCE_IN_STAGING_FILE) { + wimlib_assert(mount_flags & WIMLIB_MOUNT_FLAG_READWRITE); + wimlib_assert(lte->staging_file_name); + struct stat native_stat; + if (stat(lte->staging_file_name, &native_stat) != 0) { + DEBUG("Failed to stat `%s': %m", + lte->staging_file_name); + return -errno; + } + stbuf->st_size = native_stat.st_size; + } else { + stbuf->st_size = lte->resource_entry.original_size; + } + } else { + stbuf->st_size = 0; + } + + stbuf->st_atime = wim_timestamp_to_unix(dentry->last_access_time); + stbuf->st_mtime = wim_timestamp_to_unix(dentry->last_write_time); + stbuf->st_ctime = wim_timestamp_to_unix(dentry->creation_time); + stbuf->st_blocks = (stbuf->st_size + 511) / 512; + return 0; +} + +/* Creates a new staging file and returns its file descriptor opened for + * writing. + * + * @name_ret: A location into which the a pointer to the newly allocated name of + * the staging file is stored. + * @return: The file descriptor for the new file. Returns -1 and sets errno on + * error, for any reason possible from the creat() function. + */ +static int create_staging_file(char **name_ret, int open_flags) +{ + size_t name_len; + char *name; + struct stat stbuf; + int fd; + int errno_save; + + name_len = staging_dir_name_len + 1 + SHA1_HASH_SIZE; + name = MALLOC(name_len + 1); + if (!name) { + errno = ENOMEM; + return -1; + } + + do { + + memcpy(name, staging_dir_name, staging_dir_name_len); + name[staging_dir_name_len] = '/'; + randomize_char_array_with_alnum(name + staging_dir_name_len + 1, + SHA1_HASH_SIZE); + name[name_len] = '\0'; + + + /* Just in case, verify that the randomly generated name doesn't name an + * existing file, and try again if so */ + } while (stat(name, &stbuf) == 0); + + if (errno != ENOENT) + /* other error! */ + return -1; + + /* doesn't exist--- ok */ + + DEBUG("Creating staging file `%s'", name); + + fd = open(name, open_flags | O_CREAT | O_TRUNC, 0600); + if (fd == -1) { + errno_save = errno; + FREE(name); + errno = errno_save; + } else { + *name_ret = name; + } + return fd; +} + +/* + * Removes open file descriptors from a lookup table entry @old_lte where the + * file descriptors have opened the corresponding file resource in the context + * of the hard link group @link_group; these file descriptors are extracted and + * placed in a new lookup table entry, which is returned. + */ +static struct lookup_table_entry * +lte_extract_fds(struct lookup_table_entry *old_lte, u64 link_group) +{ + u16 num_transferred_fds; + struct lookup_table_entry *new_lte; + + new_lte = new_lookup_table_entry(); + if (!new_lte) + return NULL; + + num_transferred_fds = 0; + for (u16 i = 0; i < old_lte->num_allocated_fds; i++) + if (old_lte->fds[i] && old_lte->fds[i]->dentry && + old_lte->fds[i]->dentry->link_group_id == link_group) + num_transferred_fds++; + DEBUG("Transferring %u file descriptors", + num_transferred_fds); + new_lte->fds = MALLOC(num_transferred_fds * sizeof(new_lte->fds[0])); + if (!new_lte->fds) { + FREE(new_lte); + return NULL; + } + for (u16 i = 0, j = 0; ; i++) { + if (old_lte->fds[i] && old_lte->fds[i]->dentry && + old_lte->fds[i]->dentry->link_group_id == link_group) { + struct wimlib_fd *fd = old_lte->fds[i]; + old_lte->fds[i] = NULL; + fd->lte = new_lte; + fd->idx = j; + new_lte->fds[j] = fd; + if (++j == num_transferred_fds) + break; + } + } + DEBUG("old_lte: %u fds open; new_lte: %u fds open", + old_lte->num_opened_fds, new_lte->num_opened_fds); + old_lte->num_opened_fds -= num_transferred_fds; + new_lte->num_opened_fds = num_transferred_fds; + new_lte->num_allocated_fds = num_transferred_fds; + return new_lte; +} + +/* + * Transfers an alternate data stream entry to a new lookup table entry + */ +static void lte_transfer_ads_entry(struct lookup_table_entry *new_lte, + struct ads_entry *ads_entry) +{ + list_del(&ads_entry->lte_group_list.list); + list_add(&ads_entry->lte_group_list.list, &new_lte->lte_group_list); + ads_entry->lte = new_lte; +} + +/* + * Transfers a dentry to a new lookup table entry + */ +static void lte_transfer_dentry(struct lookup_table_entry *new_lte, + struct dentry *dentry) +{ + wimlib_assert(dentry->lte_group_list.list.next); + wimlib_assert(new_lte->lte_group_list.next); + list_del(&dentry->lte_group_list.list); + list_add(&dentry->lte_group_list.list, &new_lte->lte_group_list); + dentry->lte = new_lte; +} + +static void lte_transfer_stream_entries(struct lookup_table_entry *new_lte, + struct dentry *dentry, + unsigned stream_idx) +{ + INIT_LIST_HEAD(&new_lte->lte_group_list); + if (stream_idx == 0) { + struct list_head *pos = &dentry->link_group_list; + do { + struct dentry *d; + d = container_of(pos, struct dentry, link_group_list); + wimlib_assert(d->link_group_id == dentry->link_group_id); + lte_transfer_dentry(new_lte, d); + pos = pos->next; + } while (pos != &dentry->link_group_list); + } else { + struct ads_entry *ads_entry; + wimlib_assert(stream_idx <= dentry->num_ads); + ads_entry = &dentry->ads_entries[stream_idx - 1]; + lte_transfer_ads_entry(new_lte, ads_entry); + } +} + +/* + * Extract a WIM resource to the staging directory. + * + * @dentry, @stream_idx: The stream on whose behalf we are modifying the lookup + * table entry (these may be more streams than this that reference the lookup + * table entry) + * + * @lte: Pointer to pointer to the lookup table entry for the stream we need to + * extract, or NULL if there was no lookup table entry present for the stream + * + * @size: Number of bytes of the stream we want to extract (this supports the + * wimfs_truncate() function). + */ +static int extract_resource_to_staging_dir(struct dentry *dentry, + unsigned stream_idx, + struct lookup_table_entry **lte, + off_t size) +{ + char *staging_file_name; + int ret; + int fd; + struct lookup_table_entry *old_lte, *new_lte; + size_t link_group_size; + + /* + * We need to: + * - Create a staging file for the WIM resource + * - Extract the resource to it + * - Create a new lte for the file resource + * - Transfer fds from the old lte to the new lte, but only if they share the + * same hard link group as this dentry. If there is no old lte, then this + * step does not need to be done + * - Transfer stream entries from the old lte's list to the new lte's list. If + * there is no old lte, we instead transfer entries for the hard link group. + * + * Note: *lte is permitted to be NULL, in which case there is no old + * lookup table entry. + */ + + DEBUG("Extracting resource `%s' to staging directory", dentry->full_path_utf8); + + old_lte = *lte; + fd = create_staging_file(&staging_file_name, O_WRONLY); + if (fd == -1) + return -errno; + + if (old_lte) + ret = extract_wim_resource_to_fd(old_lte, fd, size); + else + ret = 0; + if (ret != 0 || close(fd) != 0) { + if (errno != 0) + ret = -errno; + else + ret = -EIO; + close(fd); + goto out_delete_staging_file; + } + + link_group_size = dentry_link_group_size(dentry); + + if (old_lte) { + if (link_group_size == old_lte->refcnt) { + /* This hard link group is the only user of the lookup + * table entry, so we can re-use it. */ + DEBUG("Re-using lookup table entry"); + lookup_table_unlink(w->lookup_table, old_lte); + new_lte = old_lte; + } else { + DEBUG("Splitting lookup table entry " + "(link_group_size = %zu, lte refcnt = %u)", + link_group_size, old_lte->refcnt); + /* Split a hard link group away from the "lookup table + * entry" hard link group (i.e. we had two hard link + * groups that were identical, but now we are changing + * one of them) */ + + /* XXX + * The ADS really complicate things here and not + * everything is going to work correctly yet. For + * example it could be the same that a file contains two + * file streams that are identical and therefore share + * the same lookup table entry despite the fact that the + * streams themselves are not hardlinked. + * XXX*/ + wimlib_assert(old_lte->refcnt > link_group_size); + + new_lte = lte_extract_fds(old_lte, dentry->link_group_id); + if (!new_lte) { + ret = -ENOMEM; + goto out_delete_staging_file; + } + + lte_transfer_stream_entries(new_lte, dentry, stream_idx); + old_lte->refcnt -= link_group_size; + } + } else { + /* No old_lte was supplied, so the resource had no lookup table + * entry before (it must be an empty resource) */ + new_lte = new_lookup_table_entry(); + if (!new_lte) { + ret = -ENOMEM; + goto out_delete_staging_file; + } + lte_transfer_stream_entries(new_lte, dentry, stream_idx); + } + new_lte->resource_entry.original_size = size; + new_lte->refcnt = link_group_size; + random_hash(new_lte->hash); + if (new_lte->staging_file_name) + FREE(new_lte->staging_file_name); + new_lte->staging_file_name = staging_file_name; + new_lte->resource_location = RESOURCE_IN_STAGING_FILE; + + lookup_table_insert(w->lookup_table, new_lte); + list_add(&new_lte->staging_list, &staging_list); + *lte = new_lte; + return 0; +out_delete_staging_file: + unlink(staging_file_name); + FREE(staging_file_name); + return ret; +} /* * Creates a randomly named staging directory and returns its name into the @@ -81,7 +543,7 @@ static void make_staging_dir() staging_dir_name = MALLOC(staging_dir_name_len + 1); if (!staging_dir_name) { - ERROR("Out of memory!\n"); + ERROR("Out of memory"); return; } @@ -93,8 +555,8 @@ static void make_staging_dir() staging_dir_name[staging_dir_name_len] = '\0'; if (mkdir(staging_dir_name, 0700) != 0) { - ERROR("Failed to create temporary directory `%s': %m\n", - staging_dir_name); + ERROR_WITH_ERRNO("Failed to create temporary directory `%s'", + staging_dir_name); FREE(staging_dir_name); staging_dir_name = NULL; } @@ -115,7 +577,11 @@ static int remove_file_or_directory(const char *fpath, const struct stat *sb, */ static inline int delete_staging_dir() { - return nftw(staging_dir_name, remove_file_or_directory, 10, FTW_DEPTH); + int ret; + + ret = nftw(staging_dir_name, remove_file_or_directory,10, FTW_DEPTH); + staging_dir_name = NULL; + return ret; } /* Name and message queue descriptors for message queues between the filesystem @@ -191,13 +657,13 @@ static int open_message_queues(bool daemon) unmount_to_daemon_mq_name = strcat_dup(slash, mount_dir_basename, prefix, u2d_suffix); if (!unmount_to_daemon_mq_name) { - ERROR("Out of memory!\n"); + ERROR("Out of memory"); return WIMLIB_ERR_NOMEM; } daemon_to_unmount_mq_name = strcat_dup(slash, mount_dir_basename, prefix, d2u_suffix); if (!daemon_to_unmount_mq_name) { - ERROR("Out of memory!\n"); + ERROR("Out of memory"); ret = WIMLIB_ERR_NOMEM; goto err1; } @@ -216,7 +682,7 @@ static int open_message_queues(bool daemon) 0700, NULL); if (unmount_to_daemon_mq == -1) { - ERROR("mq_open(): %m\n"); + ERROR_WITH_ERRNO("mq_open()"); ret = WIMLIB_ERR_MQUEUE; goto err2; } @@ -230,7 +696,7 @@ static int open_message_queues(bool daemon) 0700, NULL); if (daemon_to_unmount_mq == -1) { - ERROR("mq_open(): %m\n"); + ERROR_WITH_ERRNO("mq_open()"); ret = WIMLIB_ERR_MQUEUE; goto err3; } @@ -255,19 +721,19 @@ static int mq_get_msgsize(mqd_t mq) if (mq_getattr(unmount_to_daemon_mq, &attr) == 0) { msgsize = attr.mq_msgsize; } else { - ERROR("mq_getattr(): %m\n"); - ERROR("Attempting to read %s\n", msgsize_max_file); + ERROR_WITH_ERRNO("mq_getattr()"); + ERROR("Attempting to read %s", msgsize_max_file); fp = fopen(msgsize_max_file, "rb"); if (fp) { if (fscanf(fp, "%d", &msgsize) != 1) { - ERROR("Assuming message size of 8192\n"); + ERROR("Assuming message size of 8192"); msgsize = 8192; } fclose(fp); } else { - ERROR("Failed to open file %s: %m\n", - msgsize_max_file); - ERROR("Assuming message size of 8192\n"); + ERROR_WITH_ERRNO("Failed to open the file `%s'", + msgsize_max_file); + ERROR("Assuming message size of 8192"); msgsize = 8192; } } @@ -291,52 +757,88 @@ static int wimfs_access(const char *path, int mask) /* Closes the staging file descriptor associated with the lookup table entry, if * it is opened. */ -static int close_staging_file(struct lookup_table_entry *lte, void *ignore) +static int close_lte_fds(struct lookup_table_entry *lte) { - if (lte->staging_file_name && lte->staging_num_times_opened) { - if (close(lte->staging_fd) != 0) { - ERROR("Failed close file `%s': %m\n", - lte->staging_file_name); - return WIMLIB_ERR_WRITE; + for (u16 i = 0, j = 0; j < lte->num_opened_fds; i++) { + if (lte->fds[i] && lte->fds[i]->staging_fd != -1) { + wimlib_assert(lte->resource_location == RESOURCE_IN_STAGING_FILE); + wimlib_assert(lte->staging_file_name); + if (close(lte->fds[i]->staging_fd) != 0) { + ERROR_WITH_ERRNO("Failed close file `%s'", + lte->staging_file_name); + return WIMLIB_ERR_WRITE; + } + j++; } } return 0; } +static void lte_list_change_lte_ptr(struct lookup_table_entry *lte, + struct lookup_table_entry *newptr) +{ + struct list_head *pos; + struct stream_list_head *head; + list_for_each(pos, <e->lte_group_list) { + head = container_of(pos, struct stream_list_head, list); + if (head->type == STREAM_TYPE_ADS) { + struct ads_entry *ads_entry; + ads_entry = container_of(head, struct ads_entry, lte_group_list); + + ads_entry->lte = newptr; + } else { + wimlib_assert(head->type == STREAM_TYPE_NORMAL); + + struct dentry *dentry; + dentry = container_of(head, struct dentry, lte_group_list); + + dentry->lte = newptr; + } + } +} + -/* Calculates the SHA1 sum for @dentry if its file resource is in a staging - * file. Updates the SHA1 sum in the dentry and the lookup table entry. If - * there is already a lookup table entry with the same checksum, increment its - * reference count and destroy the lookup entry with the updated checksum. */ -static int calculate_sha1sum_for_staging_file(struct dentry *dentry, void *lookup_table) +static int update_lte_of_staging_file(struct lookup_table_entry *lte, + struct lookup_table *table) { - struct lookup_table *table; - struct lookup_table_entry *lte; - struct lookup_table_entry *existing; + struct lookup_table_entry *duplicate_lte; int ret; + u8 hash[SHA1_HASH_SIZE]; + struct stat stbuf; - table = lookup_table; - lte = lookup_resource(table, dentry->hash); - - if (lte && lte->staging_file_name) { + wimlib_assert(lte->resource_location == RESOURCE_IN_STAGING_FILE); + wimlib_assert(lte->staging_file_name); - DEBUG("Calculating SHA1 hash for file `%s'\n", dentry->file_name_utf8); - ret = sha1sum(lte->staging_file_name, dentry->hash); - if (ret != 0) - return ret; + ret = sha1sum(lte->staging_file_name, hash); + if (ret != 0) + return ret; - lookup_table_unlink(table, lte); - memcpy(lte->hash, dentry->hash, WIM_HASH_SIZE); - existing = lookup_resource(table, dentry->hash); - if (existing) { - DEBUG("Merging duplicate lookup table entries for " - "file `%s'\n", dentry->file_name_utf8); - free_lookup_table_entry(lte); - existing->refcnt++; - } else { - lookup_table_insert(table, lte); + lookup_table_unlink(table, lte); + + duplicate_lte = __lookup_resource(table, hash); + + if (duplicate_lte) { + /* Merge duplicate lookup table entries */ + + lte_list_change_lte_ptr(lte, duplicate_lte); + duplicate_lte->refcnt += lte->refcnt; + list_splice(<e->lte_group_list, + &duplicate_lte->lte_group_list); + + free_lookup_table_entry(lte); + } else { + if (stat(lte->staging_file_name, &stbuf) != 0) { + ERROR_WITH_ERRNO("Failed to stat `%s'", lte->staging_file_name); + return WIMLIB_ERR_STAT; } + wimlib_assert(<e->file_on_disk == <e->staging_file_name); + lte->resource_location = RESOURCE_IN_FILE_ON_DISK; + copy_hash(lte->hash, hash); + lte->resource_entry.original_size = stbuf.st_size; + lte->resource_entry.size = stbuf.st_size; + lookup_table_insert(table, lte); } + return 0; } @@ -344,46 +846,38 @@ static int calculate_sha1sum_for_staging_file(struct dentry *dentry, void *looku static int rebuild_wim(WIMStruct *w, bool check_integrity) { int ret; - struct dentry *root; + struct lookup_table_entry *lte, *tmp; - root = wim_root_dentry(w); - - DEBUG("Closing all staging file descriptors.\n"); /* Close all the staging file descriptors. */ - ret = for_lookup_table_entry(w->lookup_table, - close_staging_file, NULL); - if (ret != 0) { - ERROR("Failed to close all staging files!\n"); - return ret; + DEBUG("Closing all staging file descriptors."); + list_for_each_entry(lte, &staging_list, staging_list) { + ret = close_lte_fds(lte); + if (ret != 0) + return ret; } - DEBUG("Calculating SHA1 checksums for all new staging files.\n"); /* Calculate SHA1 checksums for all staging files, and merge unnecessary * lookup table entries. */ - ret = for_dentry_in_tree(root, calculate_sha1sum_for_staging_file, - w->lookup_table); - if (ret != 0) { - ERROR("Failed to calculate new SHA1 checksums!\n"); - return ret; + DEBUG("Calculating SHA1 checksums for all new staging files."); + list_for_each_entry_safe(lte, tmp, &staging_list, staging_list) { + ret = update_lte_of_staging_file(lte, w->lookup_table); + if (ret != 0) + return ret; } xml_update_image_info(w, w->current_image); ret = wimlib_overwrite(w, check_integrity); if (ret != 0) { - ERROR("Failed to commit changes\n"); + ERROR("Failed to commit changes"); return ret; } - ret = delete_staging_dir(); - if (ret != 0) - ERROR("Failed to delete the staging directory: %m\n"); return ret; } /* Called when the filesystem is unmounted. */ static void wimfs_destroy(void *p) { - /* For read-write mounts, the `imagex unmount' command, which is * running in a separate process and is executing the * wimlib_unmount() function, will send this process a byte @@ -412,8 +906,8 @@ static void wimfs_destroy(void *p) gettimeofday(&now, NULL); timeout.tv_sec = now.tv_sec + 3; timeout.tv_nsec = now.tv_usec * 1000; - DEBUG("Waiting for message telling us whether to commit or not, " - "and whether to include integrity checks.\n"); + DEBUG("Waiting for message telling us whether to commit or not, and " + "whether to include integrity checks."); bytes_received = mq_timedreceive(unmount_to_daemon_mq, msg, msgsize, NULL, &timeout); @@ -421,233 +915,356 @@ static void wimfs_destroy(void *p) check_integrity = msg[1]; if (bytes_received == -1) { if (errno == ETIMEDOUT) { - ERROR("Timed out.\n"); + ERROR("Timed out."); } else { - ERROR("mq_timedreceive(): %m\n"); + ERROR_WITH_ERRNO("mq_timedreceive()"); } - ERROR("Not committing.\n"); + ERROR("Not committing."); } else { - DEBUG("Received message: [%d %d]\n", msg[0], msg[1]); + DEBUG("Received message: [%d %d]", msg[0], msg[1]); } - if (commit && (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)) { - status = chdir(working_directory); - if (status != 0) { - ERROR("chdir(): %m\n"); - status = WIMLIB_ERR_NOTDIR; - goto done; + status = 0; + if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) { + if (commit) { + status = chdir(working_directory); + if (status != 0) { + ERROR_WITH_ERRNO("chdir()"); + status = WIMLIB_ERR_NOTDIR; + goto done; + } + status = rebuild_wim(w, (check_integrity != 0)); + } + ret = delete_staging_dir(); + if (ret != 0) { + ERROR_WITH_ERRNO("Failed to delete the staging " + "directory"); + if (status == 0) + status = ret; } - status = rebuild_wim(w, (check_integrity != 0)); } else { - status = 0; + DEBUG("Read-only mount"); } done: + DEBUG("Sending status %u", status); ret = mq_send(daemon_to_unmount_mq, &status, 1, 1); - if (ret == -1) { - ERROR("Failed to send status to unmount process: %m\n"); - } + if (ret == -1) + ERROR_WITH_ERRNO("Failed to send status to unmount process"); close_message_queues(); } +#if 0 +static int wimfs_fallocate(const char *path, int mode, + off_t offset, off_t len, struct fuse_file_info *fi) +{ + struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh; + wimlib_assert(fd->staging_fd != -1); + return fallocate(fd->staging_fd, mode, offset, len); +} + +static int wimfs_fgetattr(const char *path, struct stat *stbuf, + struct fuse_file_info *fi) +{ + struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh; + return dentry_to_stbuf(fd->dentry, stbuf); +} +#endif + +static int wimfs_ftruncate(const char *path, off_t size, + struct fuse_file_info *fi) +{ + struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh; + int ret = ftruncate(fd->staging_fd, size); + if (ret != 0) + return ret; + fd->lte->resource_entry.original_size = size; + return 0; +} + /* * Fills in a `struct stat' that corresponds to a file or directory in the WIM. */ static int wimfs_getattr(const char *path, struct stat *stbuf) { - struct dentry *dentry = get_dentry(w, path); + struct dentry *dentry; + int ret; + + ret = lookup_resource(w, path, + get_lookup_flags() | LOOKUP_FLAG_DIRECTORY_OK, + &dentry, NULL, NULL); + if (ret != 0) + return ret; + return dentry_to_stbuf(dentry, stbuf); +} + +#ifdef ENABLE_XATTR +/* Read an alternate data stream through the XATTR interface, or get its size */ +static int wimfs_getxattr(const char *path, const char *name, char *value, + size_t size) +{ + int ret; + struct dentry *dentry; + struct ads_entry *ads_entry; + size_t res_size; + struct lookup_table_entry *lte; + + if (!(mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR)) + return -ENOTSUP; + + if (strlen(name) < 5 || memcmp(name, "user.", 5) != 0) + return -ENOATTR; + name += 5; + + dentry = get_dentry(w, path); if (!dentry) return -ENOENT; - dentry_to_stbuf(dentry, stbuf, w->lookup_table); - return 0; + ads_entry = dentry_get_ads_entry(dentry, name); + if (!ads_entry) + return -ENOATTR; + + lte = ads_entry->lte; + res_size = wim_resource_size(lte); + + if (size == 0) + return res_size; + if (res_size > size) + return -ERANGE; + ret = read_full_wim_resource(lte, (u8*)value); + if (ret != 0) + return -EIO; + return res_size; } +#endif -/* - * Create a directory in the WIM. - * @mode is currently ignored. - */ -static int wimfs_mkdir(const char *path, mode_t mode) +/* Create a hard link */ +static int wimfs_link(const char *to, const char *from) { - struct dentry *parent; - struct dentry *newdir; - const char *basename; - - parent = get_parent_dentry(w, path); - if (!parent) + struct dentry *to_dentry, *from_dentry, *from_dentry_parent; + const char *link_name; + + to_dentry = get_dentry(w, to); + if (!to_dentry) return -ENOENT; + if (!dentry_is_regular_file(to_dentry)) + return -EPERM; - if (!dentry_is_directory(parent)) + from_dentry_parent = get_parent_dentry(w, from); + if (!from_dentry_parent) + return -ENOENT; + if (!dentry_is_directory(from_dentry_parent)) return -ENOTDIR; - basename = path_basename(path); - if (get_dentry_child_with_name(parent, basename)) + link_name = path_basename(from); + if (get_dentry_child_with_name(from_dentry_parent, link_name)) return -EEXIST; + from_dentry = clone_dentry(to_dentry); + if (!from_dentry) + return -ENOMEM; + if (change_dentry_name(from_dentry, link_name) != 0) { + FREE(from_dentry); + return -ENOMEM; + } - newdir = new_dentry(basename); - newdir->attributes |= WIM_FILE_ATTRIBUTE_DIRECTORY; - link_dentry(newdir, parent); - return 0; -} - -/* Creates a new staging file and returns its file descriptor opened for - * writing. - * - * @name_ret: A location into which the a pointer to the newly allocated name of - * the staging file is stored. - * @return: The file descriptor for the new file. Returns -1 and sets errno on - * error, for any reason possible from the creat() function. - */ -static int create_staging_file(char **name_ret) -{ - size_t name_len; - char *name; - struct stat stbuf; - int fd; - int errno_save; + /* Add the new dentry to the dentry list for the link group */ + list_add(&from_dentry->link_group_list, &to_dentry->link_group_list); - name_len = staging_dir_name_len + 1 + WIM_HASH_SIZE; - name = MALLOC(name_len + 1); - if (!name) { - errno = ENOMEM; - return -1; + /* Increment reference counts for the unnamed file stream and all + * alternate data streams. */ + if (from_dentry->lte) { + list_add(&from_dentry->lte_group_list.list, + &to_dentry->lte_group_list.list); + from_dentry->lte->refcnt++; + } + for (u16 i = 0; i < from_dentry->num_ads; i++) { + struct ads_entry *ads_entry = &from_dentry->ads_entries[i]; + if (ads_entry->lte) + ads_entry->lte->refcnt++; } - memcpy(name, staging_dir_name, staging_dir_name_len); - name[staging_dir_name_len] = '/'; - randomize_char_array_with_alnum(name + staging_dir_name_len + 1, - WIM_HASH_SIZE); - name[name_len] = '\0'; + /* The ADS entries are owned by another dentry. */ + from_dentry->ads_entries_status = ADS_ENTRIES_USER; + link_dentry(from_dentry, from_dentry_parent); + return 0; +} - /* Just in case, verify that the randomly generated name doesn't name an - * existing file, and try again if so */ - if (stat(name, &stbuf) == 0) { - /* stat succeeded-- the file must exist. Try another name. */ - FREE(name); - return create_staging_file(name_ret); - } else { - if (errno != ENOENT) - /* other error! */ - return -1; - /* doesn't exist--- ok */ - } +#ifdef ENABLE_XATTR +static int wimfs_listxattr(const char *path, char *list, size_t size) +{ + struct dentry *dentry; + int ret; + char *p = list; + size_t needed_size; + unsigned i; + if (!(mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR)) + return -ENOTSUP; - DEBUG("Creating staging file '%s'\n", name); + /* List alternate data streams, or get the list size */ - fd = creat(name, 0600); - if (fd == -1) { - errno_save = errno; - FREE(name); - errno = errno_save; + ret = lookup_resource(w, path, get_lookup_flags(), &dentry, NULL, NULL); + if (ret != 0) + return ret; + if (size == 0) { + needed_size = 0; + for (i = 0; i < dentry->num_ads; i++) + needed_size += dentry->ads_entries[i].stream_name_utf8_len + 6; + return needed_size; } else { - *name_ret = name; + for (i = 0; i < dentry->num_ads; i++) { + needed_size = dentry->ads_entries[i].stream_name_utf8_len + 6; + if (needed_size > size) + return -ERANGE; + p += sprintf(p, "user.%s", + dentry->ads_entries[i].stream_name_utf8) + 1; + size -= needed_size; + } + return p - list; } - return fd; } +#endif -/* Creates a regular file. This is done in the staging directory. */ -static int wimfs_mknod(const char *path, mode_t mode, dev_t rdev) +/* + * Create a directory in the WIM. + * @mode is currently ignored. + */ +static int wimfs_mkdir(const char *path, mode_t mode) { - struct dentry *parent, *dentry; + struct dentry *parent; + struct dentry *newdir; const char *basename; - struct lookup_table_entry *lte; - char *tmpfile_name; - int fd; - int err; - - /* Make sure that the parent of @path exists and is a directory, and - * that the dentry named by @path does not already exist. */ + parent = get_parent_dentry(w, path); if (!parent) return -ENOENT; + if (!dentry_is_directory(parent)) return -ENOTDIR; + basename = path_basename(path); - if (get_dentry_child_with_name(parent, path)) + if (get_dentry_child_with_name(parent, basename)) return -EEXIST; - dentry = new_dentry(basename); - - /* XXX fill in a temporary random hash value- really should check for - * duplicates */ - randomize_byte_array(dentry->hash, WIM_HASH_SIZE); + newdir = new_dentry(basename); + newdir->attributes |= FILE_ATTRIBUTE_DIRECTORY; + newdir->resolved = true; + newdir->link_group_id = next_link_group_id++; + link_dentry(newdir, parent); + return 0; +} - /* Create a lookup table entry having the same hash value */ - lte = new_lookup_table_entry(); - lte->staging_num_times_opened = 0; - lte->resource_entry.original_size = 0; - memcpy(lte->hash, dentry->hash, WIM_HASH_SIZE); - fd = create_staging_file(&tmpfile_name); +/* Creates a regular file. */ +static int wimfs_mknod(const char *path, mode_t mode, dev_t rdev) +{ + const char *stream_name; + if ((mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS) + && (stream_name = path_stream_name(path))) { + /* Make an alternate data stream */ + struct ads_entry *new_entry; + struct dentry *dentry; + + char *p = (char*)stream_name - 1; + wimlib_assert(*p == ':'); + *p = '\0'; + + dentry = get_dentry(w, path); + if (!dentry || !dentry_is_regular_file(dentry)) + return -ENOENT; + if (dentry_get_ads_entry(dentry, stream_name)) + return -EEXIST; + new_entry = dentry_add_ads(dentry, stream_name); + if (!new_entry) + return -ENOENT; + } else { + struct dentry *dentry, *parent; + const char *basename; - if (fd == -1) - goto mknod_error; + /* Make a normal file (not an alternate data stream) */ - if (close(fd) != 0) - goto mknod_error; + /* Make sure that the parent of @path exists and is a directory, and + * that the dentry named by @path does not already exist. */ + parent = get_parent_dentry(w, path); + if (!parent) + return -ENOENT; + if (!dentry_is_directory(parent)) + return -ENOTDIR; - lte->staging_file_name = tmpfile_name; + basename = path_basename(path); + if (get_dentry_child_with_name(parent, path)) + return -EEXIST; - /* Insert the lookup table entry, and link the new dentry with its - * parent. */ - lookup_table_insert(w->lookup_table, lte); - link_dentry(dentry, parent); + dentry = new_dentry(basename); + if (!dentry) + return -ENOMEM; + dentry->resolved = true; + dentry->link_group_id = next_link_group_id++; + dentry->lte_group_list.type = STREAM_TYPE_NORMAL; + INIT_LIST_HEAD(&dentry->lte_group_list.list); + link_dentry(dentry, parent); + } return 0; -mknod_error: - err = errno; - free_lookup_table_entry(lte); - return -err; } + /* Open a file. */ static int wimfs_open(const char *path, struct fuse_file_info *fi) { struct dentry *dentry; struct lookup_table_entry *lte; - - dentry = get_dentry(w, path); + int ret; + struct wimlib_fd *fd; + unsigned stream_idx; - if (!dentry) - return -EEXIST; - if (dentry_is_directory(dentry)) - return -EISDIR; - lte = wim_lookup_resource(w, dentry); + ret = lookup_resource(w, path, get_lookup_flags(), &dentry, <e, + &stream_idx); + if (ret != 0) + return ret; - if (lte) { - /* If this file is in the staging directory and the file is not - * currently open, open it. */ - if (lte->staging_file_name && lte->staging_num_times_opened == 0) { - lte->staging_fd = open(lte->staging_file_name, O_RDWR); - if (lte->staging_fd == -1) - return -errno; - lte->staging_offset = 0; + if (!lte) { + /* Empty file with no lookup-table entry. This is fine if it's + * a read-only filesystem. Otherwise we need to create a lookup + * table entry so that we can keep track of the file descriptors + * (this is important in case someone opens the file for + * writing) */ + if (!(mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)) { + fi->fh = 0; + return 0; } - } else { - /* no lookup table entry, so the file must be empty. Create a - * lookup table entry for the file. */ - char *tmpfile_name; - int err; - int fd; - lte = new_lookup_table_entry(); - if (!lte) - return -ENOMEM; + ret = extract_resource_to_staging_dir(dentry, stream_idx, + <e, 0); + if (ret != 0) + return ret; + } - fd = create_staging_file(&tmpfile_name); + ret = alloc_wimlib_fd(lte, &fd); + if (ret != 0) + return ret; - if (fd == -1) { - err = errno; - free(lte); + fd->dentry = dentry; + + /* The file resource may be in the staging directory (read-write + * mounts only) or in the WIM. If it's in the staging + * directory, we need to open a native file descriptor for the + * corresponding file. Otherwise, we can read the file resource + * directly from the WIM file if we are opening it read-only, + * but we need to extract the resource to the staging directory + * if we are opening it writable. */ + if (flags_writable(fi->flags) && + lte->resource_location != RESOURCE_IN_STAGING_FILE) { + ret = extract_resource_to_staging_dir(dentry, stream_idx, <e, + lte->resource_entry.original_size); + if (ret != 0) + return ret; + } + if (lte->resource_location == RESOURCE_IN_STAGING_FILE) { + fd->staging_fd = open(lte->staging_file_name, fi->flags); + if (fd->staging_fd == -1) { + close_wimlib_fd(fd); return -errno; } - lte->resource_entry.original_size = 0; - randomize_byte_array(lte->hash, WIM_HASH_SIZE); - memcpy(dentry->hash, lte->hash, WIM_HASH_SIZE); - lte->staging_file_name = tmpfile_name; - lte->staging_fd = fd; - lte->staging_offset = 0; - lookup_table_insert(w->lookup_table, lte); } - lte->staging_num_times_opened++; + fi->fh = (uintptr_t)fd; return 0; } @@ -657,8 +1274,12 @@ static int wimfs_opendir(const char *path, struct fuse_file_info *fi) struct dentry *dentry; dentry = get_dentry(w, path); - if (!dentry || !dentry_is_directory(dentry)) + if (!dentry) + return -ENOENT; + if (!dentry_is_directory(dentry)) return -ENOTDIR; + dentry->num_times_opened++; + fi->fh = (uintptr_t)dentry; return 0; } @@ -667,67 +1288,48 @@ static int wimfs_opendir(const char *path, struct fuse_file_info *fi) * Read data from a file in the WIM or in the staging directory. */ static int wimfs_read(const char *path, char *buf, size_t size, - off_t offset, struct fuse_file_info *fi) + off_t offset, struct fuse_file_info *fi) { - struct dentry *dentry; - struct lookup_table_entry *lte; - - dentry = get_dentry(w, path); + struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh; - if (!dentry) - return -EEXIST; - - if (!dentry_is_regular_file(dentry)) - return -EISDIR; - - lte = wim_lookup_resource(w, dentry); - - if (!lte) + if (!fd) { + /* Empty file with no lookup table entry on read-only mounted + * WIM */ + wimlib_assert(!(mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)); return 0; + } - if (lte->staging_file_name) { + wimlib_assert(fd->lte); - /* Read from staging */ - int fd; - off_t cur_offset; - ssize_t ret; + if (fd->lte->resource_location == RESOURCE_IN_STAGING_FILE) { + /* Read from staging file */ - if (lte->staging_num_times_opened == 0) - return -EBADF; + wimlib_assert(fd->lte->staging_file_name); + wimlib_assert(fd->staging_fd != -1); - fd = lte->staging_fd; - cur_offset = lte->staging_offset; - if (cur_offset != offset) - if (lseek(fd, offset, SEEK_SET) == -1) - return -errno; - lte->staging_offset = offset; + ssize_t ret; + DEBUG("Seek to offset %zu", offset); - ret = read(fd, buf, size); + if (lseek(fd->staging_fd, offset, SEEK_SET) == -1) + return -errno; + ret = read(fd->staging_fd, buf, size); if (ret == -1) return -errno; - lte->staging_offset = offset + ret; - return ret; } else { - /* Read from WIM */ - struct resource_entry *res_entry; - int ctype; + const struct resource_entry *res_entry; - res_entry = <e->resource_entry; - - ctype = wim_resource_compression_type(w, res_entry); + res_entry = &fd->lte->resource_entry; if (offset > res_entry->original_size) return -EOVERFLOW; size = min(size, res_entry->original_size - offset); - if (read_resource(w->fp, res_entry->size, - res_entry->original_size, - res_entry->offset, ctype, size, - offset, buf) != 0) + if (read_wim_resource(fd->lte, (u8*)buf, + size, offset, false) != 0) return -EIO; return size; } @@ -736,69 +1338,113 @@ static int wimfs_read(const char *path, char *buf, size_t size, /* Fills in the entries of the directory specified by @path using the * FUSE-provided function @filler. */ static int wimfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler, - off_t offset, struct fuse_file_info *fi) + off_t offset, struct fuse_file_info *fi) { - struct dentry *parent; - struct dentry *child; - struct stat st; - - parent = get_dentry(w, path); - - if (!parent) - return -EEXIST; - - if (!dentry_is_directory(parent)) - return -ENOTDIR; + struct dentry *parent, *child; + + parent = (struct dentry*)(uintptr_t)fi->fh; + wimlib_assert(parent); + child = parent->children; filler(buf, ".", NULL, 0); filler(buf, "..", NULL, 0); - child = parent->children; - if (!child) return 0; do { - memset(&st, 0, sizeof(st)); - if (filler(buf, child->file_name_utf8, &st, 0)) + if (filler(buf, child->file_name_utf8, NULL, 0)) return 0; child = child->next; } while (child != parent->children); return 0; } -/* Close a file. */ -static int wimfs_release(const char *path, struct fuse_file_info *fi) + +static int wimfs_readlink(const char *path, char *buf, size_t buf_len) { - struct dentry *dentry; - struct lookup_table_entry *lte; + struct dentry *dentry = get_dentry(w, path); int ret; - - dentry = get_dentry(w, path); if (!dentry) - return -EEXIST; - lte = wim_lookup_resource(w, dentry); + return -ENOENT; + if (!dentry_is_symlink(dentry)) + return -EINVAL; + + ret = dentry_readlink(dentry, buf, buf_len, w); + if (ret > 0) + ret = 0; + return ret; +} - if (!lte) +/* Close a file. */ +static int wimfs_release(const char *path, struct fuse_file_info *fi) +{ + struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh; + + if (!fd) { + /* Empty file with no lookup table entry on read-only mounted + * WIM */ + wimlib_assert(!(mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)); return 0; - - if (lte->staging_num_times_opened == 0) - return -EBADF; + } - if (--lte->staging_num_times_opened == 0 && lte->staging_file_name) { - ret = close(lte->staging_fd); - if (ret != 0) - return -errno; + if (flags_writable(fi->flags) && fd->dentry) { + u64 now = get_wim_timestamp(); + fd->dentry->last_access_time = now; + fd->dentry->last_write_time = now; } + + return close_wimlib_fd(fd); +} + +static int wimfs_releasedir(const char *path, struct fuse_file_info *fi) +{ + struct dentry *dentry = (struct dentry *)(uintptr_t)fi->fh; + + wimlib_assert(dentry); + wimlib_assert(dentry->num_times_opened); + if (--dentry->num_times_opened == 0) + free_dentry(dentry); return 0; } +#ifdef ENABLE_XATTR +/* Remove an alternate data stream through the XATTR interface */ +static int wimfs_removexattr(const char *path, const char *name) +{ + struct dentry *dentry; + struct ads_entry *ads_entry; + if (!(mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR)) + return -ENOTSUP; + + if (strlen(name) < 5 || memcmp(name, "user.", 5) != 0) + return -ENOATTR; + name += 5; + + dentry = get_dentry(w, path); + if (!dentry) + return -ENOENT; + + ads_entry = dentry_get_ads_entry(dentry, name); + if (!ads_entry) + return -ENOATTR; + remove_ads(dentry, ads_entry, w->lookup_table); + return 0; +} +#endif + /* Renames a file or directory. See rename (3) */ static int wimfs_rename(const char *from, const char *to) { struct dentry *src; struct dentry *dst; struct dentry *parent_of_dst; + char *file_name_utf16 = NULL, *file_name_utf8 = NULL; + u16 file_name_utf16_len, file_name_utf8_len; + int ret; + + /* This rename() implementation currently only supports actual files + * (not alternate data streams) */ src = get_dentry(w, from); if (!src) @@ -806,7 +1452,19 @@ static int wimfs_rename(const char *from, const char *to) dst = get_dentry(w, to); + + ret = get_names(&file_name_utf16, &file_name_utf8, + &file_name_utf16_len, &file_name_utf8_len, + path_basename(to)); + if (ret != 0) + return -ENOMEM; + if (dst) { + /* Destination file exists */ + + if (src == dst) /* Same file */ + return 0; + if (!dentry_is_directory(src)) { /* Cannot rename non-directory to directory. */ if (dentry_is_directory(dst)) @@ -820,19 +1478,26 @@ static int wimfs_rename(const char *from, const char *to) return -ENOTEMPTY; } parent_of_dst = dst->parent; - unlink_dentry(dst); - lookup_table_decrement_refcnt(w->lookup_table, dst->hash); - free_dentry(dst); + remove_dentry(dst, w->lookup_table); } else { + /* Destination does not exist */ parent_of_dst = get_parent_dentry(w, to); if (!parent_of_dst) return -ENOENT; + + if (!dentry_is_directory(parent_of_dst)) + return -ENOTDIR; } + FREE(src->file_name); + FREE(src->file_name_utf8); + src->file_name = file_name_utf16; + src->file_name_utf8 = file_name_utf8; + src->file_name_len = file_name_utf16_len; + src->file_name_utf8_len = file_name_utf8_len; + unlink_dentry(src); - change_dentry_name(src, path_basename(to)); link_dentry(src, parent_of_dst); - /*calculate_dentry_full_path(src);*/ return 0; } @@ -843,110 +1508,155 @@ static int wimfs_rmdir(const char *path) dentry = get_dentry(w, path); if (!dentry) - return -EEXIST; + return -ENOENT; if (!dentry_is_empty_directory(dentry)) - return -EEXIST; + return -ENOTEMPTY; unlink_dentry(dentry); - free_dentry(dentry); + if (dentry->num_times_opened == 0) + free_dentry(dentry); return 0; } -/* Extracts the resource corresponding to @dentry and its lookup table entry - * @lte to a file in the staging directory. The lookup table entry for @dentry - * is updated to point to the new file. If @lte has multiple dentries - * referencing it, a new lookup table entry is created and the hash of @dentry - * is changed to point to the new lookup table entry. - * - * Only @size bytes are extracted, to support truncating the file. - * - * Returns the negative error code on failure. - */ -static int extract_resource_to_staging_dir(struct dentry *dentry, - struct lookup_table_entry *lte, - u64 size) +#ifdef ENABLE_XATTR +/* Write an alternate data stream through the XATTR interface */ +static int wimfs_setxattr(const char *path, const char *name, + const char *value, size_t size, int flags) { - int err, fd; - bool ret; - char *staging_file_name; - struct lookup_table_entry *new_lte; + struct dentry *dentry; + struct ads_entry *existing_ads_entry; + struct ads_entry *new_ads_entry; + struct lookup_table_entry *existing_lte; + struct lookup_table_entry *lte; + u8 value_hash[SHA1_HASH_SIZE]; - /* File in WIM. Copy it to the staging directory. */ - fd = create_staging_file(&staging_file_name); - if (fd == -1) - return -errno; + if (!(mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR)) + return -ENOTSUP; - ret = extract_resource_to_fd(w, <e->resource_entry, fd, size); - if (ret != 0) { - if (errno != 0) - ret = -errno; - else - ret = -EIO; - unlink(staging_file_name); - FREE(staging_file_name); - return ret; + if (strlen(name) < 5 || memcmp(name, "user.", 5) != 0) + return -ENOATTR; + name += 5; + + dentry = get_dentry(w, path); + if (!dentry) + return -ENOENT; + existing_ads_entry = dentry_get_ads_entry(dentry, name); + if (existing_ads_entry) { + if (flags & XATTR_CREATE) + return -EEXIST; + remove_ads(dentry, existing_ads_entry, w->lookup_table); + } else { + if (flags & XATTR_REPLACE) + return -ENOATTR; } + new_ads_entry = dentry_add_ads(dentry, name); + if (!new_ads_entry) + return -ENOMEM; - if (lte->refcnt != 1) { - /* Need to make a new lookup table entry if we are - * changing only one copy of a hardlinked entry */ - lte->refcnt--; + sha1_buffer((const u8*)value, size, value_hash); - new_lte = new_lookup_table_entry(); - if (!new_lte) + existing_lte = __lookup_resource(w->lookup_table, value_hash); + + if (existing_lte) { + lte = existing_lte; + lte->refcnt++; + } else { + u8 *value_copy; + lte = new_lookup_table_entry(); + if (!lte) + return -ENOMEM; + value_copy = MALLOC(size); + if (!value_copy) { + FREE(lte); return -ENOMEM; - randomize_byte_array(dentry->hash, WIM_HASH_SIZE); - memcpy(new_lte->hash, dentry->hash, WIM_HASH_SIZE); + } + memcpy(value_copy, value, size); + lte->resource_location = RESOURCE_IN_ATTACHED_BUFFER; + lte->attached_buffer = value_copy; + lte->resource_entry.original_size = size; + lte->resource_entry.size = size; + lte->resource_entry.flags = 0; + copy_hash(lte->hash, value_hash); + lookup_table_insert(w->lookup_table, lte); + } + new_ads_entry->lte = lte; + return 0; +} +#endif + +static int wimfs_symlink(const char *to, const char *from) +{ + struct dentry *dentry_parent, *dentry; + const char *link_name; + struct lookup_table_entry *lte; + + dentry_parent = get_parent_dentry(w, from); + if (!dentry_parent) + return -ENOENT; + if (!dentry_is_directory(dentry_parent)) + return -ENOTDIR; - new_lte->resource_entry.flags = 0; - new_lte->staging_num_times_opened = lte->staging_num_times_opened; + link_name = path_basename(from); - lookup_table_insert(w->lookup_table, new_lte); + if (get_dentry_child_with_name(dentry_parent, link_name)) + return -EEXIST; + dentry = new_dentry(link_name); + if (!dentry) + return -ENOMEM; - lte = new_lte; - } + dentry->attributes = FILE_ATTRIBUTE_REPARSE_POINT; + dentry->reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK; + dentry->link_group_id = next_link_group_id++; - lte->resource_entry.original_size = size; - lte->staging_file_name = staging_file_name; - - if (lte->staging_num_times_opened == 0) - close(fd); - else - lte->staging_fd = fd; + if (dentry_set_symlink(dentry, to, w->lookup_table, <e) != 0) + goto out_free_dentry; + + wimlib_assert(lte); + + dentry->ads_entries[1].lte_group_list.type = STREAM_TYPE_ADS; + list_add(&dentry->ads_entries[1].lte_group_list.list, + <e->lte_group_list); + wimlib_assert(dentry->resolved); + + link_dentry(dentry, dentry_parent); return 0; +out_free_dentry: + free_dentry(dentry); + return -ENOMEM; } + /* Reduce the size of a file */ static int wimfs_truncate(const char *path, off_t size) { struct dentry *dentry; struct lookup_table_entry *lte; int ret; + unsigned stream_idx; + + ret = lookup_resource(w, path, get_lookup_flags(), &dentry, + <e, &stream_idx); - dentry = get_dentry(w, path); - if (!dentry) - return -EEXIST; - lte = wim_lookup_resource(w, dentry); + if (ret != 0) + return ret; if (!lte) /* Already a zero-length file */ return 0; + if (lte->staging_file_name) { - /* File on disk. Call POSIX API */ - if (lte->staging_num_times_opened != 0) - ret = ftruncate(lte->staging_fd, size); - else - ret = truncate(lte->staging_file_name, size); + ret = truncate(lte->staging_file_name, size); if (ret != 0) return -errno; - dentry_update_all_timestamps(dentry); lte->resource_entry.original_size = size; - return 0; } else { /* File in WIM. Extract it to the staging directory, but only * the first @size bytes of it. */ - return extract_resource_to_staging_dir(dentry, lte, size); + ret = extract_resource_to_staging_dir(dentry, stream_idx, + <e, size); } + dentry_update_all_timestamps(dentry); + return ret; } /* Remove a regular file */ @@ -954,155 +1664,279 @@ static int wimfs_unlink(const char *path) { struct dentry *dentry; struct lookup_table_entry *lte; + int ret; + unsigned stream_idx; - dentry = get_dentry(w, path); - if (!dentry) - return -EEXIST; + ret = lookup_resource(w, path, get_lookup_flags(), &dentry, + <e, &stream_idx); - if (!dentry_is_regular_file(dentry)) - return -EEXIST; + if (ret != 0) + return ret; - lte = wim_lookup_resource(w, dentry); - if (lte) { - if (lte->staging_file_name) - if (unlink(lte->staging_file_name) != 0) - return -errno; - lookup_table_decrement_refcnt(w->lookup_table, dentry->hash); + if (stream_idx == 0) { + /* We are removing the full dentry including all alternate data + * streams. */ + remove_dentry(dentry, w->lookup_table); + } else { + /* We are removing an alternate data stream. */ + remove_ads(dentry, &dentry->ads_entries[stream_idx - 1], + w->lookup_table); } - - unlink_dentry(dentry); - free_dentry(dentry); + /* Beware: The lookup table entry(s) may still be referenced by users + * that have opened the corresponding streams. They are freed later in + * wimfs_release() when the last file user has closed the stream. */ return 0; } -/* Writes to a file in the WIM filesystem. */ -static int wimfs_write(const char *path, const char *buf, size_t size, - off_t offset, struct fuse_file_info *fi) +/* + * Change the timestamp on a file dentry. + * + * Note that alternate data streams do not have their own timestamps. + */ +static int wimfs_utimens(const char *path, const struct timespec tv[2]) { - struct dentry *dentry; - struct lookup_table_entry *lte; - ssize_t ret; - - dentry = get_dentry(w, path); + struct dentry *dentry = get_dentry(w, path); if (!dentry) - return -EEXIST; - lte = wim_lookup_resource(w, dentry); + return -ENOENT; + if (tv[0].tv_nsec != UTIME_OMIT) { + if (tv[0].tv_nsec == UTIME_NOW) + dentry->last_access_time = get_wim_timestamp(); + else + dentry->last_access_time = timespec_to_wim_timestamp(&tv[0]); + } + if (tv[1].tv_nsec != UTIME_OMIT) { + if (tv[1].tv_nsec == UTIME_NOW) + dentry->last_write_time = get_wim_timestamp(); + else + dentry->last_write_time = timespec_to_wim_timestamp(&tv[1]); + } + return 0; +} - if (!lte) /* this should not happen */ - return -EEXIST; +/* Writes to a file in the WIM filesystem. + * It may be an alternate data stream, but here we don't even notice because we + * just get a lookup table entry. */ +static int wimfs_write(const char *path, const char *buf, size_t size, + off_t offset, struct fuse_file_info *fi) +{ + struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh; + int ret; - if (lte->staging_num_times_opened == 0) - return -EBADF; - if (lte->staging_file_name) { + wimlib_assert(fd); + wimlib_assert(fd->lte); + wimlib_assert(fd->lte->staging_file_name); + wimlib_assert(fd->staging_fd != -1); - /* File in staging directory. We can write to it directly. */ + /* Seek to the requested position */ + if (lseek(fd->staging_fd, offset, SEEK_SET) == -1) + return -errno; - /* Seek to correct position in file if needed. */ - if (lte->staging_offset != offset) { - if (lseek(lte->staging_fd, offset, SEEK_SET) == -1) - return -errno; - lte->staging_offset = offset; - } + /* Write the data. */ + ret = write(fd->staging_fd, buf, size); + if (ret == -1) + return -errno; - /* Write the data. */ - ret = write(lte->staging_fd, buf, size); - if (ret == -1) - return -errno; + return ret; +} - /* Adjust the stored offset of staging_fd. */ - lte->staging_offset = offset + ret; +static struct fuse_operations wimfs_operations = { + .access = wimfs_access, + .destroy = wimfs_destroy, +#if 0 + .fallocate = wimfs_fallocate, + .fgetattr = wimfs_fgetattr, +#endif + .ftruncate = wimfs_ftruncate, + .getattr = wimfs_getattr, +#ifdef ENABLE_XATTR + .getxattr = wimfs_getxattr, +#endif + .link = wimfs_link, +#ifdef ENABLE_XATTR + .listxattr = wimfs_listxattr, +#endif + .mkdir = wimfs_mkdir, + .mknod = wimfs_mknod, + .open = wimfs_open, + .opendir = wimfs_opendir, + .read = wimfs_read, + .readdir = wimfs_readdir, + .readlink = wimfs_readlink, + .release = wimfs_release, + .releasedir = wimfs_releasedir, +#ifdef ENABLE_XATTR + .removexattr = wimfs_removexattr, +#endif + .rename = wimfs_rename, + .rmdir = wimfs_rmdir, +#ifdef ENABLE_XATTR + .setxattr = wimfs_setxattr, +#endif + .symlink = wimfs_symlink, + .truncate = wimfs_truncate, + .unlink = wimfs_unlink, + .utimens = wimfs_utimens, + .write = wimfs_write, +}; - /* Increase file size if needed. */ - if (lte->resource_entry.original_size < lte->staging_offset) - lte->resource_entry.original_size = lte->staging_offset; - /* The file has been modified, so all its timestamps must be - * updated. */ - dentry_update_all_timestamps(dentry); - return ret; - } else { - /* File in the WIM. We must extract it to the staging directory - * before it can be written to. */ - ret = extract_resource_to_staging_dir(dentry, lte, - lte->resource_entry.original_size); - if (ret != 0) - return ret; - else - return wimfs_write(path, buf, size, offset, fi); +static int check_lte_refcnt(struct lookup_table_entry *lte, void *ignore) +{ + size_t lte_group_size = 0; + struct list_head *cur; + list_for_each(cur, <e->lte_group_list) + lte_group_size++; + if (lte_group_size > lte->refcnt) { +#ifdef ENABLE_ERROR_MESSAGES + struct dentry *example_dentry; + struct list_head *next; + struct stream_list_head *head; + WARNING("The following lookup table entry has a reference count " + "of %u, but", lte->refcnt); + WARNING("We found %zu references to it", lte_group_size); + next = lte->lte_group_list.next; + head = container_of(next, struct stream_list_head, list); + if (head->type == STREAM_TYPE_NORMAL) { + example_dentry = container_of(head, struct dentry, + lte_group_list); + WARNING("(One dentry referencing it is at `%s')", + example_dentry->full_path_utf8); + } + print_lookup_table_entry(lte); +#endif + /* Guess what! install.wim for Windows 8 contains a stream with + * 2 dentries referencing it, but the lookup table entry has + * reference count of 1. So we will need to handle this case + * and not just make it be an error... I'm just setting the + * reference count to the number of references we found. */ + + #if 1 + lte->refcnt = lte_group_size; + WARNING("Fixing reference count"); + #else + return WIMLIB_ERR_INVALID_DENTRY; + #endif } + return 0; } - -static struct fuse_operations wimfs_oper = { - .access = wimfs_access, - .destroy = wimfs_destroy, - .getattr = wimfs_getattr, - .mkdir = wimfs_mkdir, - .mknod = wimfs_mknod, - .open = wimfs_open, - .opendir = wimfs_opendir, - .read = wimfs_read, - .readdir = wimfs_readdir, - .release = wimfs_release, - .rename = wimfs_rename, - .rmdir = wimfs_rmdir, - .truncate = wimfs_truncate, - .unlink = wimfs_unlink, - .write = wimfs_write, -}; - - /* Mounts a WIM file. */ WIMLIBAPI int wimlib_mount(WIMStruct *wim, int image, const char *dir, - int flags) + int flags, WIMStruct **additional_swms, + unsigned num_additional_swms) { int argc = 0; - char *argv[6]; + char *argv[16]; int ret; char *p; + struct lookup_table *joined_tab, *wim_tab_save; DEBUG("Mount: wim = %p, image = %d, dir = %s, flags = %d, ", wim, image, dir, flags); - if (!dir) + if (!wim || !dir) return WIMLIB_ERR_INVALID_PARAM; + ret = verify_swm_set(wim, additional_swms, num_additional_swms); + if (ret != 0) + return ret; + + if (num_additional_swms) { + ret = new_joined_lookup_table(wim, additional_swms, + num_additional_swms, + &joined_tab); + if (ret != 0) + return ret; + wim_tab_save = wim->lookup_table; + wim->lookup_table = joined_tab; + } + ret = wimlib_select_image(wim, image); if (ret != 0) - return ret; + goto out; + + DEBUG("Selected image %d", image); + + next_link_group_id = assign_link_group_ids(wim->image_metadata[image - 1].lgt); + + DEBUG("Resolving lookup table entries"); + /* Resolve all the lookup table entries of the dentry tree */ + for_dentry_in_tree(wim_root_dentry(wim), dentry_resolve_ltes, + wim->lookup_table); + + DEBUG("Checking lookup table entry reference counts"); + + ret = for_lookup_table_entry(wim->lookup_table, check_lte_refcnt, NULL); + if (ret != 0) + goto out; if (flags & WIMLIB_MOUNT_FLAG_READWRITE) wim_get_current_image_metadata(wim)->modified = true; + if (!(flags & (WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_NONE | + WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR | + WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS))) + flags |= WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR; + + DEBUG("Getting current directory"); + mount_dir = dir; working_directory = getcwd(NULL, 0); if (!working_directory) { - ERROR("Could not determine current directory: %m\n"); - return WIMLIB_ERR_NOTDIR; + ERROR_WITH_ERRNO("Could not determine current directory"); + ret = WIMLIB_ERR_NOTDIR; + goto out; } + DEBUG("Closing POSIX message queues"); + /* XXX hack to get rid of the message queues if they already exist for + * some reason (maybe left over from a previous mount that wasn't + * unmounted correctly) */ + ret = open_message_queues(true); + if (ret != 0) + goto out; + close_message_queues(); + + DEBUG("Preparing arguments to fuse_main()"); + + p = STRDUP(dir); - if (!p) - return WIMLIB_ERR_NOMEM; + if (!p) { + ret = WIMLIB_ERR_NOMEM; + goto out; + } - argv[argc++] = "mount"; + argv[argc++] = "imagex"; argv[argc++] = p; argv[argc++] = "-s"; /* disable multi-threaded operation */ - if (flags & WIMLIB_MOUNT_FLAG_DEBUG) { + if (flags & WIMLIB_MOUNT_FLAG_DEBUG) argv[argc++] = "-d"; - } - if (!(flags & WIMLIB_MOUNT_FLAG_READWRITE)) { - argv[argc++] = "-o"; - argv[argc++] = "ro"; - } else { + + /* + * We provide the use_ino option because we are going to assign inode + * numbers oursides. We've already numbered the hard link groups with + * unique numbers with the assign_link_groups() function, and the static + * variable next_link_group_id is set to the next available link group + * ID that we will assign to new dentries. + */ + char optstring[256] = "use_ino"; + argv[argc++] = "-o"; + argv[argc++] = optstring; + if ((flags & WIMLIB_MOUNT_FLAG_READWRITE)) { + /* Read-write mount. Make the staging directory */ make_staging_dir(); if (!staging_dir_name) { FREE(p); - return WIMLIB_ERR_MKDIR; + ret = WIMLIB_ERR_MKDIR; + goto out; } + } else { + /* Read-only mount */ + strcat(optstring, ",ro"); } + argv[argc] = NULL; #ifdef ENABLE_DEBUG { @@ -1121,9 +1955,15 @@ WIMLIBAPI int wimlib_mount(WIMStruct *wim, int image, const char *dir, w = wim; mount_flags = flags; - ret = fuse_main(argc, argv, &wimfs_oper, NULL); - - return (ret == 0) ? 0 : WIMLIB_ERR_FUSE; + ret = fuse_main(argc, argv, &wimfs_operations, NULL); + if (ret) + ret = WIMLIB_ERR_FUSE; +out: + if (num_additional_swms) { + free_lookup_table(wim->lookup_table); + wim->lookup_table = wim_tab_save; + } + return ret; } @@ -1157,24 +1997,24 @@ WIMLIBAPI int wimlib_unmount(const char *dir, int flags) mount_dir = dir; pid = fork(); if (pid == -1) { - ERROR("Failed to fork(): %m\n"); + ERROR_WITH_ERRNO("Failed to fork()"); return WIMLIB_ERR_FORK; } if (pid == 0) { execlp("fusermount", "fusermount", "-u", dir, NULL); - ERROR("Failed to execute `fusermount': %m\n"); + ERROR_WITH_ERRNO("Failed to execute `fusermount'"); return WIMLIB_ERR_FUSERMOUNT; } ret = waitpid(pid, &status, 0); if (ret == -1) { - ERROR("Failed to wait for fusermount process to " - "terminate: %m\n"); + ERROR_WITH_ERRNO("Failed to wait for fusermount process to " + "terminate"); return WIMLIB_ERR_FUSERMOUNT; } if (status != 0) { - ERROR("fusermount exited with status %d!\n", status); + ERROR("fusermount exited with status %d", status); return WIMLIB_ERR_FUSERMOUNT; } @@ -1189,13 +2029,13 @@ WIMLIBAPI int wimlib_unmount(const char *dir, int flags) msg[0] = (flags & WIMLIB_UNMOUNT_FLAG_COMMIT) ? 1 : 0; msg[1] = (flags & WIMLIB_UNMOUNT_FLAG_CHECK_INTEGRITY) ? 1 : 0; - DEBUG("Sending message: %s, %s\n", + DEBUG("Sending message: %s, %s", (msg[0] == 0) ? "don't commit" : "commit", (msg[1] == 0) ? "don't check" : "check"); ret = mq_send(unmount_to_daemon_mq, msg, 2, 1); if (ret == -1) { - ERROR("Failed to notify filesystem daemon whether " - "we want to commit changes or not!\n"); + ERROR("Failed to notify filesystem daemon whether we want to " + "commit changes or not"); close_message_queues(); return WIMLIB_ERR_MQUEUE; } @@ -1209,7 +2049,10 @@ WIMLIBAPI int wimlib_unmount(const char *dir, int flags) * filesystem daemon has crashed or failed for some reason. * * XXX come up with some method to determine if the filesystem - * daemon has really crashed or not. */ + * daemon has really crashed or not. + * + * XXX Idea: have mount daemon write its PID into the WIM file header? + * */ gettimeofday(&now, NULL); timeout.tv_sec = now.tv_sec + 600; @@ -1220,28 +2063,27 @@ WIMLIBAPI int wimlib_unmount(const char *dir, int flags) mailbox[0] = 0; DEBUG("Waiting for message telling us whether the unmount was " - "successful or not.\n"); + "successful or not."); ret = mq_timedreceive(daemon_to_unmount_mq, mailbox, msgsize, NULL, &timeout); errno_save = errno; close_message_queues(); if (ret == -1) { if (errno_save == ETIMEDOUT) { - ERROR("Timed out- probably the filesystem " - "daemon crashed and the WIM was not " - "written successfully.\n"); + ERROR("Timed out- probably the filesystem daemon " + "crashed and the WIM was not written " + "successfully."); return WIMLIB_ERR_TIMEOUT; } else { - ERROR("mq_receive(): %s\n", - strerror(errno_save)); + ERROR("mq_receive(): %s", strerror(errno_save)); return WIMLIB_ERR_MQUEUE; } } - DEBUG("Received message: %s\n", (mailbox[0] == 0) ? - "Unmount OK" : "Unmount Failed"); + DEBUG("Received message: %s", + (mailbox[0] == 0) ? "Unmount OK" : "Unmount Failed"); if (mailbox[0] != 0) - ERROR("Unmount failed\n"); + ERROR("Unmount failed"); return mailbox[0]; } @@ -1250,8 +2092,8 @@ WIMLIBAPI int wimlib_unmount(const char *dir, int flags) static inline int mount_unsupported_error() { - ERROR("WIMLIB was compiled with --without-fuse, which " - "disables support for mounting WIMs.\n"); + ERROR("WIMLIB was compiled with --without-fuse, which disables support " + "for mounting WIMs."); return WIMLIB_ERR_UNSUPPORTED; } @@ -1261,7 +2103,8 @@ WIMLIBAPI int wimlib_unmount(const char *dir, int flags) } WIMLIBAPI int wimlib_mount(WIMStruct *wim_p, int image, const char *dir, - int flags) + int flags, WIMStruct **additional_swms, + unsigned num_additional_swms) { return mount_unsupported_error(); }